Comprehensive utilization method for converter slag

A converter slag and residue technology, applied in the field of comprehensive utilization of converter slag, can solve environmental pollution and other problems, and achieve the effects of wide application range, wide sources and low cost

Inactive Publication Date: 2013-02-06
张悦
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  • Application Information

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Problems solved by technology

[0009] Purpose of the invention: the present invention provides a method for comprehensive utilization of converter slag, which aims to...

Method used

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  • Comprehensive utilization method for converter slag

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Effect test

Embodiment 1

[0040] (1) Pretreatment of converter slag: the converter slag (containing free calcium oxide accounts for 3% by weight, and the total amount of calcium element accounts for 23% by weight, and the total amount of iron element accounts for 24% by weight) Crush and grind to obtain a powder with a diameter of 50 μm, which is placed in a sodium carbonate solution for stirring and dissolving reaction. The dissolving reaction temperature is 35° C., and the dissolving reaction time is 20 minutes. The weight of sodium carbonate in the sodium carbonate solution is equal to the free calcium oxide in the converter slag powder 1.9 times of the weight, and the weight of water is 3.4 times of the weight of the converter slag powder. The reacted mixed solution is left to settle and filtered to obtain sodium hydroxide solution and converter slag filter residue, and the sodium hydroxide solution is heated and evaporated to dryness to obtain sodium hydroxide;

[0041] (2) Citric acid dissolution...

Embodiment 2

[0048] (1) Pretreatment of converter slag: the converter slag (containing free calcium oxide accounts for 4.6% by weight percentage, and the total amount of calcium element accounts for 34% by weight percentage, and the total amount of iron element accounts for 17% by weight percentage) Crush and grind to obtain a powder with a diameter of 170 μm, place it in a sodium carbonate solution for stirring and dissolving reaction, the dissolving reaction temperature is 60°C, and the dissolving reaction time is 60 minutes, the weight of sodium carbonate in the sodium carbonate solution is equal to the free calcium oxide in the converter slag powder 1.7 times of the weight, the weight of water is 2 times of the weight of the converter slag powder. The reacted mixed solution is left to settle and filtered to obtain sodium hydroxide solution and converter slag filter residue, and the sodium hydroxide solution is heated and evaporated to dryness to obtain sodium hydroxide;

[0049] (2) Ci...

Embodiment 3

[0056] (1) Pretreatment of converter slag: the converter slag (containing free calcium oxide accounts for 5.1% by weight, and the total amount of calcium element accounts for 28% by weight, and the total amount of iron element accounts for 28% by weight) Crushed and ground to obtain a powder with a diameter of 120 μm, placed in a sodium carbonate solution for stirring and dissolving reaction, the dissolving reaction temperature was 80°C, the dissolving reaction time was 40 minutes, and the weight of sodium carbonate in the sodium carbonate solution was equal to the free calcium oxide in the converter slag powder 1.76 times of the weight, and the weight of water is 2.9 times of the weight of the converter slag powder. The reacted mixed solution is left to settle and filtered to obtain sodium hydroxide solution and converter slag filter residue, and the sodium hydroxide solution is heated and evaporated to dryness to obtain sodium hydroxide;

[0057] (2) Citric acid dissolution ...

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Abstract

The invention provides a comprehensive utilization method for converter slag. The converter slag, which comprises free calcium oxide in weight percent more than 3%, total calcium in weight percent of 23%-38% and total iron in weight percent of 8%-28%, is used in the method as the raw material. According to the method, sodium hydroxide, calcium citrate, iron oxide, magnesium sulfate and cement additive can be obtained through processing steps including pretreatment of the converter slag, citric acid dissolution reaction and filtration, hydrolysis reaction, sulfuric acid dissolution and filtration, iron precipitation reaction, iron oxide preparation and magnesium sulfate preparation. The method aims to utilize the converter slag discharged in large scale, so as to solve the environmental pollution problem and fully utilize iron and calcium resources in the converter slag.

Description

[0001] Technical field: The present invention relates to the technical field of metallurgy and environmental protection, in particular to a comprehensive utilization method of converter slag. Background technique: [0002] my country is a big country in the steel industry. In recent years, my country's steel industry has developed rapidly. The progress of the iron and steel industry is greatly reflected in the improvement of the utilization rate of resources. In order to cope with the competition situation, it is necessary to improve the efficiency of resource utilization and reduce the discharge of pollutants. Resources and environment have become the decisive factors for the survival and development of iron and steel enterprises. [0003] Converter slag is the waste produced by converter steelmaking in iron and steel enterprises. It mainly contains calcium, iron, magnesium and silicon, and part of calcium exists in the form of free calcium oxide. Since the discharge of conv...

Claims

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Application Information

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IPC IPC(8): C22B7/04C21B3/04
CPCY02P10/20Y02W30/50
Inventor 张悦
Owner 张悦
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